n = int(input())
if 1<n<4:
  print("NO SOLUTION")
else:
  buf = ''
  for i in range(2, n+1, 2):
    buf += str(i) + ' '
  for i in range(1, n+1, 2):
    buf += str(i) + ' '
  buf.lstrip(' ')
  print(buf)